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pq = 2(1) + (-3)(1) + 1(-2)
= 2 - 3 - 2
= - 3
2) Jika p=2i-3j-k dan q=i+j-2k
pq = 2(1) + (-3)(1) + (-1)(-2)
= 2 - 3 + 2
= 1